×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Hydrofluorosilicic Acid/Fluorosilic acid and HF(aqueous)

Hydrofluorosilicic Acid/Fluorosilic acid and HF(aqueous)

Hydrofluorosilicic Acid/Fluorosilic acid and HF(aqueous)

(OP)
Does anyone have any experience with HFS(FSA)? I am trying to figure whether or not, corrosion data will be close to that of aqeous HF against Ni-Cr-Mo alloys like C276. I know Monel 400, is highly resistant to HF, and I have found some data to show that C276 and monel are good, but also Ni-Cr-Fe alloys can also be resistant. Any thoughts?

RE: Hydrofluorosilicic Acid/Fluorosilic acid and HF(aqueous)

Isn't FSA the product of the wet phosphate process that is then further processed to yield HF?

You might try the MTI publication MS-4 on Hydrogen Fluoride and Hydrofluoric Acid.
(Materials Technology Institute of the Chemical Process Industries,Inc., St Louis MO)

This is real touchy, what concentrations, impurities, and temperature and all critical.
As I recall 400 has limited use because of the risk of SCC.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: Hydrofluorosilicic Acid/Fluorosilic acid and HF(aqueous)

(OP)
Yea that's what I found out that HF is derived from, but I actually found some data in Corrosion Data Survey from NACE that showed as 400 having good resistance and c276 having a little less good, but like you said all the other factors need to be known. I did not find that much information on FSA in particular in the MTI material selector books so I started digging else where. Thanks for the reply!

RE: Hydrofluorosilicic Acid/Fluorosilic acid and HF(aqueous)

I believe that alloy G30 is used in this application. You might look for papers on this grade and see what connections you can make.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources